NATURAL HISTORY WORK IN CART AGO 77 



to work on it, but at no other time even when the abdomen 

 was stroked, rubbed, or its tip slightly irritated. By pressing 

 on the hind part of the abdomen with thumb and forefinger 

 most of the brush could be made to extrude and the process 

 completed by gently pulling with a small forceps. At no 

 time could either of us detect any odor connected with the 

 apparatus and a colorless or slightly yellow liquid that some- 

 times passed out from the abdomen was tasteless to me. 

 However in a specimen taken on May 29 above Cartago 

 there was a distinct odor resembling cedar shavings. 



This butterfly {Lycorea atergatis) had the body 30 mil- 

 limeters long and a wing expanse of 90 millimeters (3^ 

 inches). Its wings were tawny-brown, black, yellow and 

 white, black predominating on the front wings, tawny-brown 

 on the hind wings. The black on the front wings forms three 

 streaks from the base outward which unite together at half 

 the wing's length; the black outer half bears six or seven 

 mostly elongated yellow spots and some small whitish dots 

 near the wing margin. On the hind wings the black forms 

 a border containing thirteen small rounded whitish spots; 

 there are two other blackish-brown stripes united at their 

 outer ends not reaching to the black border. The head is 

 black with some small white spots, the thorax and abdomen 

 are striped with black and dull yellowish. The antennae 

 are 18 millimeters long, blackish, but the last 7 millimeters 

 yellowish. 



When the brushes were thrust out each appeared through 

 a vertical slit. Each brush consisted of a stalk and the bundle 

 of hairs. When at rest within the abdomen the hairs lie 

 inside the whitish stalk through whose translucent walls 

 they can be indistinctly seen. By the lengthening and turn- 

 ing inside out of the stalk the hairs were gradually brought 

 into view but were all closely pressed against each other 

 forming a straight, parallel-sided brush, but when the stalk 



